Resonance methods for determining the complex shear moduli of orthotropic composites

Ekel'chik, V. S.

doi:10.1007/s11029-007-0046-7

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…However, the fundamental frequency of phonation F 0 should be considered to depend also on tissue anisotropy (i.e. either the ratio of longitudinal elastic modulus to transverse elastic modulus, or the ratio of longitudinal elastic modulus to longitudinal shear modulus) (Kelleher et al, 2010), similar to findings for engineering solids (Dudek, 1970; Larsson, 1991; Ekel'chik, 2007). Histological studies of the vocal ligament have shown a strong alignment of collagen fibers in the anterior-posterior direction (Hirano et al, 1982; Ishii et al, 1996; Gray et al, 2000; Madruga de Melo et al, 2003).…”

Section: Discussionmentioning

confidence: 91%

Optical measurements of vocal fold tensile properties: Implications for phonatory mechanics

Kelleher

Siegmund

Chan

et al. 2011

Journal of Biomechanics

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In voice research, in vitro tensile stretch experiments of vocal fold tissues are commonly employed to determine the tissue biomechanical properties. In the standard stretch-release protocol, tissue deformation is computed from displacements applied to sutures inserted through the thyroid and arytenoid cartilages, with the cartilages assumed to be rigid. Here, a non-contact optical method was employed to determine the actual tissue deformation of vocal fold lamina propria specimens from three excised human larynges in uniaxial tensile tests. Specimen deformation was found to consist not only of deformation of the tissue itself, but also deformation of the cartilages, as well as suture alignment and tightening. Stress-stretch curves of a representative load cycle were characterized by an incompressible Ogden model. The initial longitudinal elastic modulus was found to be considerably higher if determined based on optical displacement measurements than typical values reported in the literature. The present findings could change the understanding of the mechanics underlying vocal fold vibration. Given the high longitudinal elastic modulus the lamina propria appeared to demonstrate a substantial level of anisotropy. Consequently, transverse shear could play a significant role in vocal fold vibration, and fundamental frequencies of phonation should be predicted by beam theories accounting for such effects.

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Section: Discussionmentioning

confidence: 91%

Optical measurements of vocal fold tensile properties: Implications for phonatory mechanics

Kelleher

Siegmund

Chan

et al. 2011

Journal of Biomechanics

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“…Different experimental techniques have been proposed in the past to identify characteristic parameters of composite materials [1][2][3][4]. Many of them are based on the use of modal parameters of beams obtained from dynamic tests, although sometimes their accuracy needs to be improved for engineering application.…”

Section: Introductionmentioning

confidence: 99%

Parameter Identification of Composite Materials Based on Spectral Model by Using Model Updating Method

Sun

Perera

Sevillano

et al. 2018

International Journal of Polymer Science

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A model updating approach based on a spectral element model and solved with a particle swarm optimization (PSO) method is proposed to identify the vibration-damping properties of composite materials. In comparison with conventional finite element model updating, a composite beam is modeled in a unified way by using a spectral approach whose computational cost is significantly reduced due to its simplicity. In this way, the dynamic response can be captured accurately by using a very limited number of elements. To identify the material properties, experimental tests are carried out to get the initial parameters that are introduced to initialize the spectral model; then, a model updating process solved with a PSO algorithm is implemented to obtain the real material parameters. It has been demonstrated that the proposed spectral model is a potential tool for model updating and parameter identification.

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“…31 Therefore, the aforementioned static methods could not accurately measure the global elastic modulus of CTT material. Ip and Tse 32 and Ekel’chik 33 used the first two or three flexural or torsional frequencies to determine the transverse flexural and shear moduli of the rectangular rods with sufficient thickness. Because CTT material used to manufacture plate and beam structures cannot achieve the same thickness as thick as these rectangular rods.…”

Section: Introductionmentioning

confidence: 99%

Determination of transverse flexural and shear moduli of chopped carbon fiber tape-reinforced thermoplastic by vibration

Takahashi

Wan

Ohsawa

2017

Journal of Composite Materials

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Chopped carbon fiber tape-reinforced thermoplastic material is specifically developed for the high-volume production of lightweight automobiles. With excellent design processability and flexibility, the carbon fiber tape-reinforced thermoplastic material is manufactured by compressing large amounts of randomly oriented, pre-impregnated unidirectional tapes in a plane. Therefore, the carbon fiber tape-reinforced thermoplastic material presents transversely isotropic properties. Transverse shear effect along the thickness direction of carbon fiber tape-reinforced thermoplastic beam has a distinct influence on its flexural deformation. Accordingly, the Timoshenko beam theory combined with vibration frequencies was proposed to determine the set of transverse flexural and shear moduli. Meanwhile, the transverse flexural and shear moduli of carbon fiber tape-reinforced thermoplastic beam were finally determined by fitting all the first seven measured and calculated eigenfrequencies with the least squares criterion. In addition, the suggested thickness to length ratio for the 3-point bending test and Euler–Bernoulli model was given.

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Resonance methods for determining the complex shear moduli of orthotropic composites

Cited by 6 publications

References 30 publications

Optical measurements of vocal fold tensile properties: Implications for phonatory mechanics

Optical measurements of vocal fold tensile properties: Implications for phonatory mechanics

Parameter Identification of Composite Materials Based on Spectral Model by Using Model Updating Method

Determination of transverse flexural and shear moduli of chopped carbon fiber tape-reinforced thermoplastic by vibration

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